Answer:
OZONE
Explanation:
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The element is Magnesium
it has electronic configuration
or
In valence cell it has 2 electrons and therefore its valency is 2
1. 4NHCO3
2. 3CaCO3
3. 5NaC2H3O
4. 6NH3
5. 2CaCl2O2
ans ( a). NHCO3
This question is so confusing, I'm sorry